# Indicator

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> Source: https://en.wikipedia.org/wiki/Indicator
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{{wiktionary|indicator}}
'''Indicator''' may refer to:

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== Biology ==
* [Environmental indicator](/source/Environmental_indicator) of environmental health (pressures, conditions and responses)
* [Ecological indicator](/source/Ecological_indicator) of ecosystem health (ecological processes)
* [Health indicator](/source/Health_indicator), which is used to describe the health of a population
* [Honeyguide](/source/Honeyguide)s, also known as "indicator birds", a family of Old World tropical birds 
** [''Indicator'' (genus)](/source/Indicator_(genus)), a genus of birds in the honeyguide family
* [Indicator species](/source/Indicator_species), a species that defines a characteristic of an environment
* [Indicator bacteria](/source/Indicator_bacteria), bacteria used to detect and estimate the level of fecal contamination of water
* [Indicator organism](/source/Indicator_organism), organisms used to measure such things as potential fecal contamination of environmental samples
* [Indicator plant](/source/Indicator_plant), a plant that acts as a measure of environmental conditions
* [Indicator value](/source/Indicator_value), one of two terms in ecology referring to the classification of organisms
* [Iodine–starch test](/source/Iodine%E2%80%93starch_test), a method to test for the presence of starch or iodine.

== Chemistry ==
* [Complexometric indicator](/source/Complexometric_indicator), a chemical detector for metal ions in complexometric titrations.
* [Humidity indicator card](/source/Humidity_indicator_card), a card impregnated with chemicals that change colour when a particular humidity is exceeded.
* [pH indicator](/source/pH_indicator), a chemical detector for protons in acid-base titrations.
* [Redox indicator](/source/Redox_indicator), a chemical detector for redox titrations.
* [Zeta potential](/source/Zeta_potential), a property of interfaces in fluids for Zeta potential titration.

== Economics ==
* [Economic indicator](/source/Economic_indicator)
* [Macroeconomic indicators](/source/Macroeconomic_indicators), economic indicators provided by agencies and bureaus of various government statistical organizations and sometimes by private organizations
* [Performance indicator](/source/Performance_indicator)
* [Technical indicator](/source/Technical_indicator), a tool used in the technical analysis of financial securities

== Mathematics, engineering, and industry ==
* [Indicator (distance amplifying instrument)](/source/Indicator_(distance_amplifying_instrument)), any of various instruments used to accurately measure small distances, and amplify them to make them more obvious
* [Indicator (metadata)](/source/Indicator_(metadata)), a Boolean value that may contain only the values true or false and includes the meaning of these values
* [Indicator (statistics)](/source/Indicator_(statistics)), a concept in statistics, research design and social sciences
* [Indicator diagram](/source/Indicator_diagram), a graph of pressure against stroke within a piston engine
* [Indicator function](/source/Indicator_function) of a subset of the domain, a concept in mathematics
* [Indicator light](/source/Indicator_lamp_(disambiguation))
* [Indicator net](/source/Indicator_net), nets anchored at various depths to the sea bed around Allied naval bases during World War II intended to entangle U-boat traffic of the enemy
* [Indicator of compromise](/source/Indicator_of_compromise), an artifact observed in computer forensics that indicates an intrusion

== Other uses ==
* [''Indicator'' (Deine Lakaien album)](/source/Indicator_(Deine_Lakaien_album)), 2010
* [''Indicator'' (Onward to Olympas album)](/source/Indicator_(Onward_to_Olympas_album)), 2012
* [Indicator Island](/source/Indicator_Island), in the Argentine Islands of Antarctica
* ''The Indicator'' (1819–1821), a weekly literary journal edited by [Leigh Hunt](/source/Leigh_Hunt)
* ''The Indicator'', a daily podcast produced by [Planet Money](/source/Planet_Money)
* A synonym for the [turn signal](/source/turn_signal) of an automobile

==See also==
* [Indicate/indication](/source/Indication_(disambiguation)) (disambiguation)

{{disambiguation}}

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Adapted from the Wikipedia article [Indicator](https://en.wikipedia.org/wiki/Indicator) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Indicator?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.